facies of contact metamorphism
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facies of contact metamorphism

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Published by Australian National University in Canberra .
Written in English

Subjects:

  • Contact metamorphism.,
  • Facies (Geology)

Book details:

Edition Notes

Statement[by] V. V. Reverdatto. Edited by V. S. Sobolev. Translated [from the Russian] by D. A. Brown.
SeriesDepartment of Geology publication,, vno. 233, Publication (Australian National University. Dept. of Geology) ;, no. 233.
Classifications
LC ClassificationsQE475.A2 R4813
The Physical Object
Paginationvii, 263 p.
Number of Pages263
ID Numbers
Open LibraryOL5312640M
ISBN 100708107052
LC Control Number72097288

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The facies of contact metamorphism. [V V Reverdatto] Contact metamorphism. Facies (Geology) Contact metamorphism; More like this: Similar Items Book: All Authors / Contributors: V V Reverdatto. Find more information about: ISBN: OCLC Number. Facies of Contact Metamorphism. The facies of contact metamorphism progress in temperature at relatively low pressure from the Albite-Epidote Hornfels Facies to the Hornblende Hornfels Facies, to the Pyroxene Hornfels Facies. Xenoliths picked up by the magma may be metamorphosed to the Sanidinite Facies, but such rocks are relatively rare. The blueschist facies is a metamorphic realm of _____. high pressure but relatively low temperature A mineral within a metamorphic rock that can be used to provide a narrow constraint on the temperature and pressure of rock formation is termed a(n) ________ mineral. The Facies of Contact Metamorphism on *FREE* shipping on qualifying offers. The Facies of Contact MetamorphismManufacturer: Geological Society.

Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (), without the protolith melting into liquid magma (a solid-state change). The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. The chemical components and crystal structures of the minerals making up the rock may change even. Metamorphic facies. Metamorphic petrologists studying contact metamorphism early in the 20th century introduced the idea of metamorphic facies (part of a rock or group of rocks that differs from the whole formation) to correlate metamorphic events. The concept was first defined in by a Finnish petrologist, Pentti Eelis Eskola, as any rock of a metamorphic formation that has attained. Along very high geothermal gradients, such as might be expected in the vicinity of intruding magmas the succession of facies would increase from the albite-epidote hornfels facies to the hornblende hornfels facies to pyroxene hornfels and sanidinite facies, the facies of contact metamorphism. This facies series is called the hornfels facies.   Metamorphic facies is not obvious in a given field specimen. To sum up, a metamorphic facies is the set of minerals found in a rock of a given composition. That mineral suite is taken as a sign of the pressure and temperature that made : Andrew Alden.

Low-pressure facies are in many cases typical for contact metamorphism, but especially in cordilleran-type mountain belts this contact metamorphism can be of regional extent due to long-lasting intrusive activity over a large area, producing a transition to regional metamorphism (Buchan-type in Scotland, Abukuma-type in Japan). Rocks in aureoles commonly show changes in mineralogy and texture (Harker, ) related primarily to distance from the contact with the the broad spectrum of changes induced mainly by heat from the intrusion, four facies of thermal metamorphism are generally accepted. This assemblage is indicative the Pyroxene Hornfels Facies. Conditions. The conditions of contact metamorphism are those of low to moderate pressure and low to high temperature. Pressures are generally less than 4 kilobars. Temperatures of metamorphism vary widely from °C. Among the controlling factors are: the temperature of the magma. Metamorphic Facies • 3) Facies of low pressure • Albite-epidote hornfels, hornblende hornfels, and pyroxene hornfels facies: contact metamorphic terranes and regional terranes with very high geothermal gradient. • Sanidinite faciesis rare- limited to xenoliths in basic magmas and the innermost portions of some contact aureoles adjacent to.